Information

PIC16F84



1998 Microchip Technology Inc. DS30430C/F84/E1A1-page 1

The PIC16F84 (Rev. A) parts you have received conform

functionally to the Device Data Sheet (DS30430

except for the anomalies described below.

All the problems listed here will be addressed in future

revisions of the PIC16F84 silicon.

1. Module: CPU (STATUS bit)

The operation of the power-down (PD

) bit in the STA-

TUS register may not function correctly for tempera-

tures below - 20 ˚C.

ork Around

None

2. Module: Data EEPROM

Do not perform a modify (set or clear a bit) of the

EECON1 register one instruction cycle after an

EEPROM read. This will corrupt the EEDATA regis-

ter.

Example:

BSF EECON1, RD

BCF EECON1, WREN

ork Around

Use either of the following two code segment in place

of the above example.

BSF EECON1, RD

NOP

BCF EECON1, WREN

BSF EECON1, RD

3. Module: Timer0

The TMR0 register may increment when the WDT

postscaler is switched to the Timer0 prescaler. If

TMR0 = FFh, this will cause TMR0 to overﬂow (set-

ting T0IF).

ork Around

Follow the following sequence:

a) Read the 8-bit TMR0 register into the W register

b) Clear the TMR0 register

c) Assign WDT postscaler to Timer0

d) Write W register to TMR0

PIC16F84 Rev. A Silicon Errata Sheet

Note:

As with any windowed EPROM device, please cover the window at all times, except when erasing.

PAGE 1
PIC16F84 PIC16F84 Rev. A Silicon Errata Sheet The PIC16F84 (Rev. A) parts you have received conform functionally to the Device Data Sheet (DS30430C), except for the anomalies described below. 3. Module: Timer0 All the problems listed here will be addressed in future revisions of the PIC16F84 silicon. The TMR0 register may increment when the WDT postscaler is switched to the Timer0 prescaler. If TMR0 = FFh, this will cause TMR0 to overflow (setting T0IF). 1.
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PIC16F84 Clarifications/Corrections to the Data Sheet: In the Device Data Sheet (DS30430C), the following clarifications and corrections should be noted. 1. Module: Data EEPROM In the PIC16F8X Data Sheet (DS30430B), the following clarifications and corrections should be noted. a) Erase/Write Cycle Time for Data EEPROM should be changed from 10 ms maximum to 20 ms maximum, as shown in Table 1. TABLE 1: DC SPECIFICATION LIMITS THAT VARY FROM DATA SHEET Actual Data Parameter No. Sym.
PAGE 3
PIC16F84  1998 Microchip Technology Inc.
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